GENSGD: Crash when adding user metadata

[guillaume Guy]

I explored a bit your GraphChi project and I found that the performance achieved is quite impressive. In addition, the ability to handle metadata makes it very appealing compared to other recommendation engines. Really good.

A point of interest I wanted to bring up is the quick tuto on the 2012 KDD cup (I know it's old):

http://bickson.blogspot.co.il/2012/12/collaborative-filtering-3rd-generation_14.html

Although the first example works fine, I noticed 2 elements:

1- The first instructions do not get me to .18 RMSE but rather to .45-.46 . Is it related to tuning or versioning (I'm guessing you have made some changes on the project)?

 ./toolkits/collaborative_filtering/gensgd --training=rec_log_train.txt --val_pos=2 --rehash=1 --limit_rating=1000000 --max_iter=100 --gensgd_mult_dec=0.999999 --minval=-1 --maxval=1 --quiet=1  --calc_error=1 --file_columns=4

2- Adding the user_features make the code crash (see logs attached). It seems to be a pointer issue. 

Thanks for the effort again.